Variable pump and variable motor speed control loop is often applied to the composition of the volume of open and closed-circuit hydraulic system. Volume loop speed control circuit by changing the pump or hydraulic motor to achieve the speed of displacement. Its main advantage is low power loss (no overflow losses and throttle loss) and the working pressure varies with the load, so that a high efficiency, low oil temperature variable pump, particularly for high-speed, high-power systems. Piston pump works schematic diagram; the drive shaft with a rotation by diesel engines, and drive cylinder rotary variable pump * maintenance, the cylinder piston and the cylinder rotates together. Swash plate does not rotate around its center point just swing around. The left end of the spherical portion of the plunger to slide on the swash plate. When the figure at the top of the plunger to the following variable pump * maintenance of telephone, the axial position of the plunger from the lower dead point went dead and go on a trip. In this case the suction of the plunger a certain amount of oil. As the plunger continues from a lower position to an upper position again when it and from the top dead center in the axial direction come lower dead point, the suction of a quantity of oil discharged from the drain hole. This is the pump discharge pressure oil. Each cylinder 1 a plunger, which is spinning cylinder with oil pump continuously from the hydraulic tank suction and discharge pressure of the hydraulic oil. * Variable pump maintenance, variable pump, hydraulic from Jinan Jing Jing Chong Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!